The solid-liquid equilibrium data for TNT and RDX in supercritial carbon dioxide (SC-CO₂) were measured at 303.0, 308.0, 323.0 and 338.0 K, and over the pressures range from 10.0 MPa to 50.0 MPa by an ultraviolet-visible (UV-Vis) detector. The effects of pressure, temperature and support effect (SE) between molecules of RDX and TNT on the solubility of TNT/RDX/SC-CO₂ system were analyzed. The results show that the solubility of TNT and RDX in ternary system TNT/RDX/SC-CO₂ is better than that in binary systems TNT/SC-CO₂ and RDX/SC-CO₂. The values of SE of TNT and RDX increase first and decrease then with the pressure increasing. The pressure turning point occured over the pressure range from 25 MPa to 28 MPa for TNT and from 13 MPa to 20 MPa for RDX.